Take your iPod or mp3 player and draw out a template on to a piece of paper. You want your template to be the length of your iPod twice, plus allowance for twice the thickness of your iPod and allowance for a flap. You will want it to be the width of your iPod plus allowance for twice the thickness.
Cut out your template and draw the shape out on to felt. Cut this felt shape out.
Place your iPod in the middle of the felt.
Fold up the bottom of the felt so that it covers most of the front of the iPod.
Pin the felt in to place. You will want this to be nice and tight.
Remove the iPod and tidy up the pins so that they are all straight.
Slip the iPod back in to make sure it fits snug. Be careful not to scratch it with the pins.
Slip the iPod out again and cut off any excess felt at the sides.
Sew up the sides of the cosy and remove the pins.
Snip the edges of the flap so that they are rounded and then turn the cosy inside out.
Cut out a rectangle (the size of your iPod's screen), a large circle (the size of the click wheel) and a smaller circle (the size of the click wheel button) out of white felt.
Stitch the rectangle, for the screen, and the large circle in place.
Stitch the smaller circle in to the middle of the larger one.
Stitch on a popper and you're all done.